Method of transforming a light beam, optical film for performing the method, and display device having the optical film
AssigneeSamsung Electronics Co., Ltd.
InventorsDae-Ho Choo, Jin-Hyuk Yun, Ho-Min Kang
Life of this patent
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Abstract
In a method of transforming light, an optical film for performing the method and a display device having the optical film, an optical film includes an anisotropic film, an isotropic film, a λ/4 phase difference film and a λ/2 phase difference film. The anisotropic film having a first refractive index with respect to a first ray and a second refractive index with respect to a second ray. A refractive index of the isotropic film is substantially identical to the first refractive index. The λ/4 phase difference film delays wavelengths of the first and second rays by about λ/4. The λ/2 phase difference film delays the wavelength of the second ray by about λ/2.
Claims11
An optical film, comprising:
- an anisotropic film having a first refractive index for a first ray and a second refractive index for a second ray, the first ray and the second ray being included in a light that is incident upon the anisotropic film from a first side in an incident direction, the first ray is polarized in a first direction that is substantially perpendicular to the incident direction, the second ray is polarized in a second direction that is substantially perpendicular to the incident direction, the second ray comprising a first component and a second component, the first ray and the second component of the second ray irradiate from the anisotropic film;
- an isotropic film provided below the anisotropic film, the isotropic film having a third refractive index that is substantially identical to the first refractive index such that the first ray and the second component of the second ray pass through the isotropic film;
- a λ/4 phase difference film provided below the isotropic film to delay a wavelength of the first ray and the second component of the second ray by approximately λ/4 when the first ray and the second component of the second ray pass through the λ/4 phase difference film;
- and
- a λ/2 phase difference film partially formed below the λ/4 phase difference film to delay the wavelength of the second component of the second ray by approximately λ/2 when the second component of the second ray passes through the λ/2 phase difference film and irradiates toward a second side that is opposite to the first side.
Dependencies are inferred from the claim text.